drivers/gpu/drm/sun4i/sun4i_drv.c

   1 /*
   2  * Copyright (C) 2015 Free Electrons
   3  * Copyright (C) 2015 NextThing Co
   4  *
   5  * Maxime Ripard <maxime.ripard@free-electrons.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of
  10  * the License, or (at your option) any later version.
  11  */
  12
  13 #include <linux/component.h>
  14 #include <linux/of_graph.h>
  15 #include <linux/of_reserved_mem.h>
  16
  17 #include <drm/drmP.h>
  18 #include <drm/drm_crtc_helper.h>
  19 #include <drm/drm_fb_cma_helper.h>
  20 #include <drm/drm_gem_cma_helper.h>
  21 #include <drm/drm_fb_helper.h>
  22 #include <drm/drm_of.h>
  23
  24 #include "sun4i_drv.h"
  25 #include "sun4i_framebuffer.h"
  26 #include "sun4i_tcon.h"
  27
  28 static const struct file_operations sun4i_drv_fops = {
  29         .owner          = THIS_MODULE,
  30         .open           = drm_open,
  31         .release        = drm_release,
  32         .unlocked_ioctl = drm_ioctl,
  33         .compat_ioctl   = drm_compat_ioctl,
  34         .poll           = drm_poll,
  35         .read           = drm_read,
  36         .llseek         = no_llseek,
  37         .mmap           = drm_gem_cma_mmap,
  38 };
  39
  40 static struct drm_driver sun4i_drv_driver = {
  41         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC,
  42
  43         /* Generic Operations */
  44         .fops                   = &sun4i_drv_fops,
  45         .name                   = "sun4i-drm",
  46         .desc                   = "Allwinner sun4i Display Engine",
  47         .date                   = "20150629",
  48         .major                  = 1,
  49         .minor                  = 0,
  50
  51         /* GEM Operations */
  52         .dumb_create            = drm_gem_cma_dumb_create,
  53         .dumb_destroy           = drm_gem_dumb_destroy,
  54         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
  55         .gem_free_object_unlocked = drm_gem_cma_free_object,
  56         .gem_vm_ops             = &drm_gem_cma_vm_ops,
  57
  58         /* PRIME Operations */
  59         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
  60         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
  61         .gem_prime_import       = drm_gem_prime_import,
  62         .gem_prime_export       = drm_gem_prime_export,
  63         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
  64         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
  65         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
  66         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
  67         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
  68
  69         /* Frame Buffer Operations */
  70 };
  71
  72 static void sun4i_remove_framebuffers(void)
  73 {
  74         struct apertures_struct *ap;
  75
  76         ap = alloc_apertures(1);
  77         if (!ap)
  78                 return;
  79
  80         /* The framebuffer can be located anywhere in RAM */
  81         ap->ranges[0].base = 0;
  82         ap->ranges[0].size = ~0;
  83
  84         drm_fb_helper_remove_conflicting_framebuffers(ap, "sun4i-drm-fb", false);
  85         kfree(ap);
  86 }
  87
  88 static int sun4i_drv_bind(struct device *dev)
  89 {
  90         struct drm_device *drm;
  91         struct sun4i_drv *drv;
  92         int ret;
  93
  94         drm = drm_dev_alloc(&sun4i_drv_driver, dev);
  95         if (IS_ERR(drm))
  96                 return PTR_ERR(drm);
  97
  98         drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
  99         if (!drv) {
 100                 ret = -ENOMEM;
 101                 goto free_drm;
 102         }
 103         drm->dev_private = drv;
 104
 105         ret = of_reserved_mem_device_init(dev);
 106         if (ret && ret != -ENODEV) {
 107                 dev_err(drm->dev, "Couldn't claim our memory region\n");
 108                 goto free_drm;
 109         }
 110
 111         /* drm_vblank_init calls kcalloc, which can fail */
 112         ret = drm_vblank_init(drm, 1);
 113         if (ret)
 114                 goto free_mem_region;
 115
 116         drm_mode_config_init(drm);
 117
 118         ret = component_bind_all(drm->dev, drm);
 119         if (ret) {
 120                 dev_err(drm->dev, "Couldn't bind all pipelines components\n");
 121                 goto cleanup_mode_config;
 122         }
 123
 124         drm->irq_enabled = true;
 125
 126         /* Remove early framebuffers (ie. simplefb) */
 127         sun4i_remove_framebuffers();
 128
 129         /* Create our framebuffer */
 130         drv->fbdev = sun4i_framebuffer_init(drm);
 131         if (IS_ERR(drv->fbdev)) {
 132                 dev_err(drm->dev, "Couldn't create our framebuffer\n");
 133                 ret = PTR_ERR(drv->fbdev);
 134                 goto cleanup_mode_config;
 135         }
 136
 137         /* Enable connectors polling */
 138         drm_kms_helper_poll_init(drm);
 139
 140         ret = drm_dev_register(drm, 0);
 141         if (ret)
 142                 goto finish_poll;
 143
 144         return 0;
 145
 146 finish_poll:
 147         drm_kms_helper_poll_fini(drm);
 148         sun4i_framebuffer_free(drm);
 149 cleanup_mode_config:
 150         drm_mode_config_cleanup(drm);
 151         drm_vblank_cleanup(drm);
 152 free_mem_region:
 153         of_reserved_mem_device_release(dev);
 154 free_drm:
 155         drm_dev_unref(drm);
 156         return ret;
 157 }
 158
 159 static void sun4i_drv_unbind(struct device *dev)
 160 {
 161         struct drm_device *drm = dev_get_drvdata(dev);
 162
 163         drm_dev_unregister(drm);
 164         drm_kms_helper_poll_fini(drm);
 165         sun4i_framebuffer_free(drm);
 166         drm_mode_config_cleanup(drm);
 167         drm_vblank_cleanup(drm);
 168         of_reserved_mem_device_release(dev);
 169         drm_dev_unref(drm);
 170 }
 171
 172 static const struct component_master_ops sun4i_drv_master_ops = {
 173         .bind   = sun4i_drv_bind,
 174         .unbind = sun4i_drv_unbind,
 175 };
 176
 177 static bool sun4i_drv_node_is_frontend(struct device_node *node)
 178 {
 179         return of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") ||
 180                 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") ||
 181                 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend");
 182 }
 183
 184 static bool sun4i_drv_node_is_tcon(struct device_node *node)
 185 {
 186         return of_device_is_compatible(node, "allwinner,sun5i-a13-tcon") ||
 187                 of_device_is_compatible(node, "allwinner,sun6i-a31-tcon") ||
 188                 of_device_is_compatible(node, "allwinner,sun6i-a31s-tcon") ||
 189                 of_device_is_compatible(node, "allwinner,sun8i-a33-tcon");
 190 }
 191
 192 static int compare_of(struct device *dev, void *data)
 193 {
 194         DRM_DEBUG_DRIVER("Comparing of node %s with %s\n",
 195                          of_node_full_name(dev->of_node),
 196                          of_node_full_name(data));
 197
 198         return dev->of_node == data;
 199 }
 200
 201 static int sun4i_drv_add_endpoints(struct device *dev,
 202                                    struct component_match **match,
 203                                    struct device_node *node)
 204 {
 205         struct device_node *port, *ep, *remote;
 206         int count = 0;
 207
 208         /*
 209          * We don't support the frontend for now, so we will never
 210          * have a device bound. Just skip over it, but we still want
 211          * the rest our pipeline to be added.
 212          */
 213         if (!sun4i_drv_node_is_frontend(node) &&
 214             !of_device_is_available(node))
 215                 return 0;
 216
 217         if (!sun4i_drv_node_is_frontend(node)) {
 218                 /* Add current component */
 219                 DRM_DEBUG_DRIVER("Adding component %s\n",
 220                                  of_node_full_name(node));
 221                 drm_of_component_match_add(dev, match, compare_of, node);
 222                 count++;
 223         }
 224
 225         /* Inputs are listed first, then outputs */
 226         port = of_graph_get_port_by_id(node, 1);
 227         if (!port) {
 228                 DRM_DEBUG_DRIVER("No output to bind\n");
 229                 return count;
 230         }
 231
 232         for_each_available_child_of_node(port, ep) {
 233                 remote = of_graph_get_remote_port_parent(ep);
 234                 if (!remote) {
 235                         DRM_DEBUG_DRIVER("Error retrieving the output node\n");
 236                         of_node_put(remote);
 237                         continue;
 238                 }
 239
 240                 /*
 241                  * If the node is our TCON, the first port is used for
 242                  * panel or bridges, and will not be part of the
 243                  * component framework.
 244                  */
 245                 if (sun4i_drv_node_is_tcon(node)) {
 246                         struct of_endpoint endpoint;
 247
 248                         if (of_graph_parse_endpoint(ep, &endpoint)) {
 249                                 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
 250                                 continue;
 251                         }
 252
 253                         if (!endpoint.id) {
 254                                 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
 255                                 continue;
 256                         }
 257                 }
 258
 259                 /* Walk down our tree */
 260                 count += sun4i_drv_add_endpoints(dev, match, remote);
 261
 262                 of_node_put(remote);
 263         }
 264
 265         return count;
 266 }
 267
 268 static int sun4i_drv_probe(struct platform_device *pdev)
 269 {
 270         struct component_match *match = NULL;
 271         struct device_node *np = pdev->dev.of_node;
 272         int i, count = 0;
 273
 274         for (i = 0;; i++) {
 275                 struct device_node *pipeline = of_parse_phandle(np,
 276                                                                 "allwinner,pipelines",
 277                                                                 i);
 278                 if (!pipeline)
 279                         break;
 280
 281                 count += sun4i_drv_add_endpoints(&pdev->dev, &match,
 282                                                 pipeline);
 283                 of_node_put(pipeline);
 284
 285                 DRM_DEBUG_DRIVER("Queued %d outputs on pipeline %d\n",
 286                                  count, i);
 287         }
 288
 289         if (count)
 290                 return component_master_add_with_match(&pdev->dev,
 291                                                        &sun4i_drv_master_ops,
 292                                                        match);
 293         else
 294                 return 0;
 295 }
 296
 297 static int sun4i_drv_remove(struct platform_device *pdev)
 298 {
 299         return 0;
 300 }
 301
 302 static const struct of_device_id sun4i_drv_of_table[] = {
 303         { .compatible = "allwinner,sun5i-a13-display-engine" },
 304         { .compatible = "allwinner,sun6i-a31-display-engine" },
 305         { .compatible = "allwinner,sun6i-a31s-display-engine" },
 306         { .compatible = "allwinner,sun8i-a33-display-engine" },
 307         { }
 308 };
 309 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
 310
 311 static struct platform_driver sun4i_drv_platform_driver = {
 312         .probe          = sun4i_drv_probe,
 313         .remove         = sun4i_drv_remove,
 314         .driver         = {
 315                 .name           = "sun4i-drm",
 316                 .of_match_table = sun4i_drv_of_table,
 317         },
 318 };
 319 module_platform_driver(sun4i_drv_platform_driver);
 320
 321 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
 322 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
 323 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
 324 MODULE_LICENSE("GPL");